AC BULK Fusion 550 is the first psu Power supply famous brand Arctic-Cooling. BULK version without the box with the power cable. It brings high performance, very good of handset as well as a good price. The psu is in the Black rendition with power output 550W 80PLUS certification and what it means to be applicable as from 82 to 86 percent. About the old 80 mm cooling fan AC Fan 8 in the rear of the psu which prefukuje and cools internal parts. The fan is regulated under the burden in the range 700 - 2000 RPM. The power supply has protection against overburdening, overvoltage, shortcircuit. Is SLI and Crossfire compatible.